Head for truing dies



UNTTED @TATE% PATENT @FFICE.

WILLIAM H. AZRES, @F BALTIMORE, MARYLAND, A$SIGNOR T0 AMERICAN CANCOMPANY, OF NEW YORK, N. '11, A CORPORATION OF NEW JERSEY.

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Sipecification of Letters Patent.

Patented Mar.2,1920.

Application filed June 16, 1315, Serial No. 34,422. Renewed July 14,1919. Serial No. 310,874.

To all whom it may concern:

Be it known that I, VVILLIAM HOWARD Arline, a citizen of the UnitedStates, residing in Baltimore, State of Maryland, have invented a newand useful Improvement in Heads for Truing Dies, of which the followingis a specification.

My invention relates in general to the formation of dies and has moreparticular reference to the formation of dies adapted to cut circularblanks of metal and the like, such, for example, dies adapted for thecutting of can heads and end closures.

The purpose of the invention is the pro vision of a head for truing orshaping the die after it is formed, which may be mounted in the tailstock of a lathe and through a rolling action bring the (.ie alreadyformed to true and accurate condition.

A further object of the invention is the provision of such an instrumentwhich may be adjusted to dies of various sizes without requiring anicety of handling so that it 'may be utilized by any mechanic familiarwith the making of dies.

A further object of the invention is the provision of such a device ofeconomical manufacture, simple construction and of permanently efficientand easy operation.

Qther objects and advantages of the invention will be apparent as it isbetter understood from the following description when considered inconnection with the accompanying drawing illustrating a preferredembodiment thereof.

Referring to the drawing,

Figure 1 is a central sectional view taken through a die truing headembodying my invention;

Fig. 2 is a top plan view thereof; and

Fig. 3 is a section taken substantially at right angles to the plane ofsection of Fig. 1.

in accordance with my invention the die truing device or head is adaptedto be used upon an ordinary lathe and to this end the moving parts aremounted in a frame lprovided with a stud or post 5 adapted to beinserted within the tail stock of a lathe, the die being trued beingheld within the revolving head, as will be later described.

The truing of the die is accomplished by a plurality of profile rollers6, two such rollers being shown in the present instance. Each of therollers 6 is provided with a groove 7 in which the edge 8 of the die 9(indicated in dotted lines) is adapted to be engaged. This groove isformed by an inclined spreading surface 10, of greater inclination thanthe inclined surface 11 of the die, and a vertical surface 12 forengagement with the outer face 13 of the die. The bottom of the grooveis cut' in slightly at let to give the desired slight extension at theedge as is desired in die presses. These rollers are preferablyconstructed of swaging roller tool steel hardened and they are eachmounted on a spindle or shaft 15 engaged in a slide 16. A plate 17,preferably of ball bearing steel hardened, is fitted in the face of theslide and between this plate and the adjacent face of the roller ballbearings 18 are inserted in suitable race-ways. Each spindle or shaft 15has a head 19 adapted to hold the parts in place. The spindles arepreferably of hardened tool steel and each is embraced by a collar 21 ofhardened steel, upon which the rollers 6 bear.

The slides 16, two in the present instance, move in a suitable way orgroove 22 in the frame or head d, this way being of any appropriate formto hold the slides in place and to direct their movement accurately. Theslides are positioned at an equal distance from the axis of rotation ofthe head ofthe lathe or an equal distance from the central axis of thestud or post 5, and they are adapted to be adjusted with respect theretoto accommodate the device to dies of different diameters. Thisadjustment is accomplished in the present instance by a pair of shafts23 and 24:. The shaft 23 is mounted to rotate under the action of asuitable hand-wheel :25, being held against motion-by a plate 26 securedon the end of the frame 4'. through screws or other suitable fasteningmeans 27. The shaft 23 is i... threaded engagement externally with oneof the slides 16 and is in threaded engagement internally with the shaft24:, which shaft is secured at its end in the other slide 16 by a pin 28and thereby held against rotation. Turning of the hand-wheel 25 willproduce a rotation of the shaft 23 and thereby produce a like movementtoward or from the axis of the stud 5 of both slides 16, one slidethrough the direct threaded engagement with the shaft 23 and the otherslide with the threaded engagement with the shaft 2%. A plate 29 issecured by screws or other fastening means 31 to close the end ofthe wayor guide 22 remote from the hand-wheel.

When it is desired to true a die the device need only be positioned inthe tail stock of a lathe and the die to be trued centered in the headof the lathe. The device is then fed forward and rotated and moved intoengagement with the grooves 7 of the rollers 6. These rollers thenrotate underthe influence 'of the die and swage and shape it to desiredformation.

It is thought that the invention and many of its attendant advantageswill be understood from the foregoing description, and it will beapparent that various changes may be made in the form, construction andarrangement of the parts without departing from the spirit and scope ofthe claims or sacrificing any of its material advantages, the formhereinbefore described being merely a preferred embodiment thereof.

I claim:

1. A head for truing dies comprising profiled rotatable shapingelements, each element being shaped to engage interiorly and exteriorlyof the die entirely to the die edge, and means for holding said shapingelements in accurate position.

2. A head for truing dies comprising a plurality of profiled shapingrolls adapted to simultaneously engage the extreme edge of the die bothinteriorly and exteriorly, and adjusting means for connecting said rollsfor moving them simultaneously toward and from a central axis.

3. A head for truing dies comprising a grooved roller having interiorlyand exteriorly acting surfaces at an angle to each other, a shaft uponwhich said grooved roller is mounted, and means for holding said shaftin accurate position.

A. A head for truing dies comprising a pair of grooved rollers rotatablymounted in alinement and at equal distances from a central axis, eachroller having interiorly and exteriorly acting surfaces at an angle toeach other.

5. A head for truing dies comprising a body, a plurality of slidesarranged thereon, a profiled shaping roller on each slide having facesintersecting at the edge of a die for engaging such die both interiorlyand exteriorly, and means for moving said slides simultaneously withrespect to a fixed axis for engaging such die both interiorly andexteriorly, a threaded shaft for each slide, and means for engaging thethreads on each slide to produce like movement in said slides underadjustment in directions substantially parallel with the axes of saidprofiled rolls.

7. A head for truing dies comprising profiled rolls rotatable throughthe agency of the die and each shaped to act both interiorly andexteriorly on the die, and means for securing said rolls in appropriatepositions nearer to or farther from each other according to the diameterof the die.

8. A head for truing dies comprising profiled shaping rolls foroperating on the edge of the die at opposite sides thereof, means forsupporting the rolls in position, and a post for fitting into the tailstock of a lathe arranged between said rolls and equidistant from bothof said rolls.

9. A head for shaping dies comprising a supporting and guiding devicehaving means for attachment to a rotary mechanism, slides mounted onsaid head and adapted to be moved simultaneously and equally toward andfrom each other, non-rotary and rotary screw shafts connecting saidslides for causing them to move in opposite directions, and profiledrollers mounted on said slides and adapted to operate upon a die.

10. A tool for shaping dies, comprising a supporting and guiding device,opposing slides mounted on said guiding device and adapted to be movedsimultaneously and equally toward and from each other, a screw held fromrotation on one of said slides, a rotary screw having a screw threadengagement with the other slide and having a screw thread engagementwith said first mentioned screw, means for turning said rotary screw,and die-shaping rollers mounted on said slides.

Signed in the presence of two subscribing witnesses.

WILLIAM H. AYRES.

l/Vitnesses T. B. SPiLLER, J. A. HAGAN.

